What are instances ? Explain each one of them ?

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Amit Singh · Answer

There can be multiple instances running in a SQL server. There are two 
types of instances: default instances and named instances.
A named instance simply means that you define a name for an instance 
during installation and that you can access the instance using this 
name. A default instance is the one that is default. There can be only 
one default instance but multiple names instances. When thee are 
multiple instance then it leads to multiple services running which 
affects the system performance. Each instance has its own SQL server and
 SQL server agents services. For default instance the name of these 
services are MSSQLSERVER and SQLSERVERAGENT and for a named instance it 
is MSSQL$instancename and SQLAgent$instancename.

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What are instances ? Explain each one of them ?

Amit Singh

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